Bayer Aktiengesellschaft

Hans-Samuel Bien, Deceased

Detlef-Ingo Schutze

Erich Klauke

Manfred Groll

Karl-Julius Reubke

Volker Ehrig

Petra Bien, Heir

Dorothee Bien

Gabriele Bien

Daniel Bien, Heir

Quinoline derivatives, especially those of the formula ##STR1## wherein X represents halogen, nitro or CF.sub.3,

Process for the preparation of quinoline derivatives

The invention relates to a novel process for the preparation of 1-acylamino-5(8)-chloroanthraquinones, which are starting materials for the preparation of vat dyes. It is characterized in that 1,5(8)-dichloroanthraquinones is reacted with ammonia at temperatures of 190.degree. to 240.degree. C., the amino groups in the reaction mixture are completely acylated and the more sparingly soluble diacylaminoanthraquinone is separated off from the more readily soluble monoacylaminochloroanthraquinone. The new process yields reaction products which are purer and cheaper than those which are obtained by conventional methods. Moreover there are smaller waste water problems.

Process for the preparation of 1-acylamino-5(8)-chloroanthraquinones

The invention relates to water-insoluble quinophthalone dyestuffs of the formula ##STR1## in which T represents W--Ar or ##STR2## and Ar denotes aryl,

Quinophthalone dyestuffs

In the reaction of a nitroanthraquinone with ammonia in a solvent at elevated temperature to produce the corresponding aminoanthraquinone, the improvement which comprises effecting the reaction in the presence of an ammonium halide. Advantageously, the nitroanthraquinone is an .alpha.-nitroanthraquinone, the ammonium halide is at least one of ammonium chloride and ammonium bromide, and the solvent comprises at least one member selected from the group consisting of water, nitrobenzene, a glycol, an acid amide and sulfolane.

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Hans-Samuel Bien, Deceased